diff --git a/froglike6/README.md b/froglike6/README.md
index 1bde718..d979d30 100644
--- a/froglike6/README.md
+++ b/froglike6/README.md
@@ -9,4 +9,5 @@
  | 5차시 | 2025.04.01 |  정수  | [개구리](https://www.acmicpc.net/problem/25333)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/17|
  | 6차시 | 2025.04.07 | 백트래킹| [N-Queen](https://www.acmicpc.net/problem/9663)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/24|
  | 7차시 | 2025.04.09 | 그래프 | [최소비용 구하기](https://www.acmicpc.net/problem/1916)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/27|
+ | 8차시 | 2025.04.11 | 물리학 | [곰곰이와 시소](https://www.acmicpc.net/problem/26072)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/31|
  ---
diff --git a/froglike6/physics/26072.py b/froglike6/physics/26072.py
new file mode 100644
index 0000000..1842833
--- /dev/null
+++ b/froglike6/physics/26072.py
@@ -0,0 +1,12 @@
+import sys
+input = sys.stdin.readline
+N, L = map(int, input().split())
+x_list = list(map(int, input().split()))
+w_list = list(map(int, input().split()))
+
+total_weight = sum(w_list)
+weighted_sum = sum(w * x for x, w in zip(x_list, w_list))
+
+pivot = weighted_sum / total_weight
+
+print(f"{pivot:.10f}")
\ No newline at end of file